Laser light source module

Abstract

A laser light source module includes a laser light source outputting laser light, a wavelength conversion element converting a wavelength of the laser light, a temperature sensor mounted on a first face of the wavelength conversion element, a heater substrate of a ceramic base material, on which the wavelength conversion element is mounted. A heater is provided on the heater substrate, in which a sub-mount substrate on which the laser light source is mounted and the heater substrate are fixed to a heat sink, and the heat sink includes a concavity at a position corresponding to a projection region of the wavelength conversion element opposite to the substrate, whereby the entire wavelength conversion element is kept at the most suitable operation temperature, and laser light can be wavelength-converted in higher efficiency.

1 . A laser light source module comprising:
 a laser light source for outputting laser light;   a wavelength conversion element for converting a wavelength of the laser light;   a temperature sensor mounted on a first face of the wavelength conversion element;   a first substrate formed of ceramic, on which the wavelength conversion element is mounted, having a heater for heating the wavelength conversion element from a second face, opposite to the first face, of the wavelength conversion element; and   a heat sink on which the first substrate is mounted;   the heater being provided at a position, including a projection region of the second face, on a surface of the first substrate, and   the heat sink supporting the first substrate at an outer side of the projection region of the second face.   
     
     
         2 . A laser light source module as recited in  claim 1 , wherein the heater is provided on a face of the first substrate opposite to a face thereof on which the wavelength conversion element is mounted,
 the heat sink has a concavity at a position including the projection region of the second face,   an outer edge of the concavity supports the first substrate, and   a heat generation portion of the heater is arranged to be inserted into the concavity and separated from the heat sink.   
     
     
         3 . A laser light source module as recited in  claim 1 , wherein the laser light source is mounted on a second substrate, and
 the second substrate is mounted on the heat sink.   
     
     
         4 . A laser light source module as recited in  claim 3 , wherein the heat sink includes a first heat sink on which the first substrate is mounted, and a second heat sink on which the second substrate is mounted, and
 the first heat sink and the second heat sink are bonded to each other.   
     
     
         5 . A laser light source module as recited in  claim 1  further comprising:
 a heat diffusion layer on a surface of the first substrate, wherein the wavelength conversion element is mounted on a surface of the heat diffusion layer in such a way that the second face of the wavelength conversion element faces the heat diffusion layer. 
 
     
     
         6 . A laser light source module as recited in  claim 5 , wherein the heat diffusion layer is configured with a thick film layer including silver particles. 
     
     
         7 . A laser light source module as recited in  claim 5 , wherein the heat diffusion layer is configured with a metal thin plate or metal foil bonded to the first substrate. 
     
     
         8 . A laser light source module as recited in  claim 1 , wherein the wavelength conversion element is mounted on a surface of the heater with the second face thereof facing the heater. 
     
     
         9 . A laser light source module as recited in  claim 1 , wherein the wavelength conversion element includes a waveguide through which the wavelength of the laser light is converted, and the waveguide is formed to face the second face of the wavelength conversion element. 
     
     
         10 . A laser light source module as recited in  claim 2 , wherein the wavelength conversion element includes a waveguide through which the wavelength of the laser light is converted, and the waveguide is formed to face the second face of the wavelength conversion element. 
     
     
         11 . A laser light source module as recited in  claim 3 , wherein the wavelength conversion element includes a waveguide through which the wavelength of the laser light is converted, and the waveguide is formed to face the second face of the wavelength conversion element. 
     
     
         12 . A laser light source module as recited in  claim 4 , wherein the wavelength conversion element includes a waveguide through which the wavelength of the laser light is converted, and the waveguide is formed to face the second face of the wavelength conversion element. 
     
     
         13 . A laser light source module as recited in  claim 5 , wherein the wavelength conversion element includes a waveguide through which the wavelength of the laser light is converted, and the waveguide is formed to face the second face of the wavelength conversion element. 
     
     
         14 . A laser light source module as recited in  claim 6 , wherein the wavelength conversion element includes a waveguide through which the wavelength of the laser light is converted, and the waveguide is formed to face the second face of the wavelength conversion element. 
     
     
         15 . A laser light source module as recited in  claim 7 , wherein the wavelength conversion element includes a waveguide through which the wavelength of the laser light is converted, and the waveguide is formed to face the second face of the wavelength conversion element. 
     
     
         16 . A laser light source module as recited in  claim 8 , wherein the wavelength conversion element includes a waveguide through which the wavelength of the laser light is converted, and the waveguide is formed to face the second face of the wavelength conversion element.